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https://issues.apache.org/jira/browse/HIVE-24515?focusedWorklogId=535257&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-535257
]
ASF GitHub Bot logged work on HIVE-24515:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 13/Jan/21 09:03
Start Date: 13/Jan/21 09:03
Worklog Time Spent: 10m
Work Description: deniskuzZ commented on a change in pull request #1834:
URL: https://github.com/apache/hive/pull/1834#discussion_r556362110
##########
File path: ql/src/java/org/apache/hadoop/hive/ql/stats/ColStatsProcessor.java
##########
@@ -204,6 +206,54 @@ public int persistColumnStats(Hive db, Table tbl) throws
HiveException, MetaExce
public void setDpPartSpecs(Collection<Partition> dpPartSpecs) {
}
+ public static boolean canSkipStatsGeneration(String dbName, String tblName,
String partName,
+ long statsWriteId, String
queryValidWriteIdList) {
+ if (queryValidWriteIdList != null) { // Can be null if its not an ACID
table.
+ ValidWriteIdList validWriteIdList = new
ValidReaderWriteIdList(queryValidWriteIdList);
+ // Just check if the write ID is valid. If it's valid (i.e. we are
allowed to see it),
+ // that means it cannot possibly be a concurrent write. As stats
optimization is enabled
+ // only in case auto gather is enabled. Thus the stats must be updated
by a valid committed
+ // transaction and stats generation can be skipped.
+ if (validWriteIdList.isWriteIdValid(statsWriteId)) {
+ try {
+ IMetaStoreClient msc = Hive.get().getMSC();
+ TxnState state = msc.findStatStatusByWriteId(dbName, tblName,
partName, statsWriteId);
Review comment:
can't we just check here if there a newer commited writeId for
table/partition and if yes - stats recompute is needed?
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Issue Time Tracking
-------------------
Worklog Id: (was: 535257)
Time Spent: 1h (was: 50m)
> Analyze table job can be skipped when stats populated are already accurate
> --------------------------------------------------------------------------
>
> Key: HIVE-24515
> URL: https://issues.apache.org/jira/browse/HIVE-24515
> Project: Hive
> Issue Type: Improvement
> Reporter: Rajesh Balamohan
> Assignee: mahesh kumar behera
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h
> Remaining Estimate: 0h
>
> For non-partitioned tables, stats detail should be present in table level,
> e.g
> {noformat}
> COLUMN_STATS_ACCURATE={"BASIC_STATS":"true","COLUMN_STATS":{"d_current_day":"true"...
> }}
> {noformat}
> For partitioned tables, stats detail should be present in partition level,
> {noformat}
> store_sales(ss_sold_date_sk=2451819)
> {totalSize=0, numRows=0, rawDataSize=0,
> COLUMN_STATS_ACCURATE={"BASIC_STATS":"true","COLUMN_STATS":{"ss_addr_sk":"true"....}}
>
> {noformat}
> When stats populated are already accurate, {{analyze table tn compute
> statistics for columns}} should skip launching the job.
>
> For ACID tables, stats are auto computed and it can skip computing stats
> again when stats are accurate.
>
>
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